package com.example.intercepter;



import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

/**
 */
@Component
public class SessionInterceptor implements HandlerInterceptor {
	
	
	private final static Logger log = LoggerFactory.getLogger(SessionInterceptor.class);
	
	
	
	 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		 
		  // 在请求处理之前进行调用  
	        log.info("1. 在请求处理之前进行调用......CustomInterceptor1......");  
	        // 只有返回true才会继续向下执行，返回false取消当前请求  

		return true;
	}

	
	 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			@Nullable ModelAndView modelAndView) throws Exception {
		 
		// 请求处理之后进行调用，但是在视图被渲染之前  
	        log.info("2. 请求处理之后进行调用，但是在视图被渲染之前......CustomInterceptor1......");  
	}

	
	 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
			@Nullable Exception ex) throws Exception {
		 
		//在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）  
	        log.info("3. 整个请求结束之后被调用......CustomInterceptor1......");  
	}

}
